Gnamptogenys atrata

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Gnamptogenys atrata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Ectatomminae
Tribe: Ectatommini
Genus: Gnamptogenys
Species: G. atrata
Binomial name
Gnamptogenys atrata
Lattke, 2004

Gnamptogenys atrata casent0900588 p 1 high.jpg

Gnamptogenys atrata casent0900588 d 1 high.jpg

Specimen Label

Only known from workers, nothing is known about the biology of Gnamptogenys atrata.

Identification

This is the largest-bodied member of the epinotalis group and besides Gnamptogenys major the only other species that is predominantly black in coloration. It is also the only species lacking ridges or denticles on the posterolateral corners of the propodeal declivity. G. major has a more triangular-shaped petiolar node in lateral view and an evenly convex margin on the clypeal lamella.

Distribution

Distribution based on Regional Taxon Lists

Indo-Australian Region: Indonesia (type locality), Sulawesi.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Not much is known about the the biology of Gnamptogenys atrata. We can speculate that the biology of this species is similar to other species of the genus. Gnamptogenys are predatory ponerine ants that inhabit tropical and subtropical mesic forests. Nesting is typically at ground level in rotten wood or leaf litter. Some exceptions include species that are arboreal, a dry forest species and species that nests in sandy savannahs. Colony size tends to be, at most, in the hundreds. Queens are the reproductives in most species. Worker reproduction is known from a few species in Southeastern Asia. Generalist predation is the primary foraging/dietary strategy. Specialization on specific groups (millipedes, beetles, other ants) has developed in a few species.

Castes

Queens and males have not been collected.

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • atrata. Gnamptogenys atrata Lattke, 2004: 160, fig. 38 (w.) INDONESIA (Sulawesi).

Description

Worker

Lattke 2004 Gnamptogenys fig 38-40

Lattke (2004) - Metrics. [Holotype] Paratypes (n = 2): HL [0.89] 0.91, 0.93; HW [0.71] 0.73, 0.75; ML [0.44] 0.43, 0.43; SL [0.63] 0.66, 0.68; ED [0.05] 0.08, 0.09; WL [1.16] 1.14, 1.11 mm. CI [0.81] 0.81, 0.80; SI [0.89] 0.91, 0.92; MI [0.62] 0.58, 0.58; OI [0.07] 0.11, 0.12. Head with anterior margin of clypeal lamella converging to form blunt obtuse angle in frontal view; clypeus longitudinally strigulose with median smooth area; clypeal lamella translucent, mostly smooth with sparse low strigulae. Pronotal dorsum with shallow piligerous punctae, each with one side deeper than other, roughly arranged in arches; rest of mesosomal dorsum mostly smooth medially, laterally punctate; pronotum strigulose-punctate laterally, punctae relatively shallow, arranged in arches; promesonotal suture feebly impressed; katepisternum strigose, anepisternum mostly smooth; mesopleural suture very broad with transverse ridges and strigulae; metapleuron relatively smooth anterodorsad and longitudinally costulate posteroventrad; lateral propodeal surface mostly smooth, propodeal dorsum slightly scabrose, mostly smooth medially; propodeal declivity mostly smooth, posterolateral ridge or denticle lacking; declivitous propodeal margin slightly convex in lateral view, propodeal spiracle mounted on tubular prominence that extends beyond declivitous margin; mesosoma in lateral view with very broadly convex dorsal margin.

Petiolar dorsum mostly smooth, sparsely punctate, punctae becoming larger laterally; postpetiole laterally with scalloped foveolate, postpetiolar dorsum sparsely punctate, posterior margin with brief longitudinal strigulae; fourth abdominal tergite sparsely punctulate, posterior margin with brief longitudinal striae; fourth abdominal sternite punctate over smooth ground sculpture. Fore coxa transversely strigulose; metacoxal tooth triangular. Dorsum of thorax and abdominal segments 1-4 with abundant erect to subdecumbent hairs. Head, mesosoma, petiole, and gaster black; mandibles, antennae, legs, and apex of propodeal spiracles and clypeal lamella brown.

Type Material

Holotype worker. Indonesia, Sulawesi Utara, 1000m, G. Mogogonipa, 24-ix-1986 (No collector data on the labels). Deposited in The Natural History Museum. Paratypes. Three workers in The Natural History Museum, 1w in Instituto de Zoologia Agricola from holotype series.

Etymology

The species name is derived from the Latin word for “dressed in black,” atratus, and alludes to the predominant body color of this ant.

References

  • Lattke, J. E. 2004. A Taxonomic Revision and Phylogenetic Analysis of the Ant Genus Gnamptogenys Roger in Southeast Asia and Australasia (Hymenoptera: Formicidae: Ponerinae). University of California Publications in Entomology 122: 1-266 (page 160, fig. 38 worker described)